This is a thread for the F325 exam as I havent seen one yet. Has anyone else started learning for this exam as my college started teaching F325 first. We can post questions and revise on this thread.
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This is a thread for the F325 exam as I havent seen one yet. Has anyone else started learning for this exam as my college started teaching F325 first. We can post questions and revise on this thread.
We're finishing cells I think and then starting acids and buffers but it's all very choppy changey at the min.. Like we jumped to carbonyls (unit 4) and then back to unit 5
Hey Guys, hows revision coming along? Can anyone explain how you draw those titration curves, and how you decide on using a suitable indicator and so on? Im so confused, I can work out the pH of the acid and alkali but how do you work out the equivalence point and the volume? Its so confusing, any help would be great, thanks
Hey Guys, hows revision coming along? Can anyone explain how you draw those titration curves, and how you decide on using a suitable indicator and so on? Im so confused, I can work out the pH of the acid and alkali but how do you work out the equivalence point and the volume? Its so confusing, any help would be great, thanks
Hi , think of the titration curves as 4 different types, so you have the strong acid vs strong alkali strong acid vs weak alkali weak acid vs strong alkali weak acid vs weak alkali now for the first example you have a strong acid, so a good example would be HCl (strong acids will have pH close to 1) and a strong alkali such as NaOH (strong alkali would level off at a pH of about 13.5) so when you actually draw this on a graph it would have a line coming out of pH at around 1 and slowly rising, and when reached at 25cm3 there will be a dramatic increase in pH, this is called the end-point its where there is a colour change. what happens is that you have a solution of HCl and you titrate it by adding NaOH, when most all all HCl have reacted there will be a colour change.
because this is a strong alkali the graph would level off at pH of around 13.5 the equivalence point is when H+ = OH- t by using certain indicators we are able to figure out the pH, in the exams they give you 3 examples of indicators with pH range and ask you to conclude which indicator will be used, and by looking at the around the equivalence point you are able to see which indicator you will use... let me explain: strong acid vs strong alkali will give you a pH of 7 (the equivalence point) what i do to help me out is mark a line at the start of the increase.. so at 25cm3 there will be an increase and at the start of that increase i will put a mark, next i will put a mark just about where it levels off, and then from those 2 i will add a middle line, and try to get a reading from that, but the best way of learning it, is by understanding the pH levels you will get for the different types of titration curves.
well i hope i helped, all the other types follow the same rule but the shapes would be different and i believe you have examples in your book or so, if you don't let me know and i will try to explain to you. if i missed anything out let me know
Hi guys, I'm preparing for my F325 exam and I am stuck on this question (calculating pH) could someone please go through this with me step by step? I get part (i) but the part (ii) i can't do - even calculating the moles of NaOH! I would appreciate any help